﻿<!DOCTYPE html>
<html>
<head>
  <title>Drag Zooming Tool</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
  <meta name="description" content="TypeScript: Users can zoom into and out of a diagram by drawing a rectangle showing what part of the document should be shown by the new viewport." />
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
</head>
<body>
  <div id="sample">
    <div id="myDiagramDiv" style="background-color: white; border: solid 1px black; width: 100%;height: 800px"></div>
    <p>
      This sample demonstrates the DragZoomingTool, which replaces the standard DragSelectingTool. It is defined in its own file, as <a href="DragZoomingTool.ts">DragZoomingTool.ts</a>.
    </p>
    <p>
      Press in the background, wait briefly, and then drag to zoom in to show the area of the drawn rectangle.
      Hold down the Shift key to zoom out.
      The rectangle always has the same aspect ratio as the viewport of the diagram.
    </p>
  </div>

  <script type="module" id="code">
    import * as go from "../release/go-module.js";
    import { DragZoomingTool } from './DragZoomingTool.js';

    if (window.goSamples) window.goSamples(); // init for these samples -- you don't need to call this
    const $ = go.GraphObject.make; // for conciseness in defining templates

    const myDiagram =
        $(go.Diagram, 'myDiagramDiv', {
            initialDocumentSpot: go.Spot.Center,
            initialViewportSpot: go.Spot.Center,
            // Define the template for Nodes, just some text inside a colored rectangle
            nodeTemplate: $(go.Node, 'Spot', { width: 70, height: 20 }, $(go.Shape, 'Rectangle', new go.Binding('fill', 'c')), $(go.TextBlock, { margin: 2 }, new go.Binding('text', 'c'))),
            // Define the template for Links, just a simple line
            linkTemplate: $(go.Link, $(go.Shape, { stroke: 'black' })),
            layout: $(go.TreeLayout, {
                angle: 90,
                nodeSpacing: 4,
                compaction: go.TreeLayout.CompactionNone
            }),
            model: $(go.TreeModel, {
                nodeKeyProperty: 'k',
                nodeParentKeyProperty: 'p'
            })
        });
    // Add an instance of the custom tool defined in DragZoomingTool.js.
    // This needs to be inserted before the standard DragSelectingTool,
    // which is normally the third Tool in the ToolManager.mouseMoveTools list.
    myDiagram.toolManager.mouseMoveTools.insertAt(2, new DragZoomingTool());
    // This is a status message
    const myLoading =
        $(go.Part, { selectable: false, location: new go.Point(0, 0) }, $(go.TextBlock, 'loading...', { stroke: 'red', font: '20pt sans-serif' }));
    // temporarily add the status indicator
    myDiagram.add(myLoading);
    // allow the myLoading indicator to be shown now,
    // but allow objects added in loadTree to also be considered part of the initial Diagram
    myDiagram.delayInitialization(loadTree);

  function loadTree() {
    // create some tree data
    const total = 99;
    const treedata = [];
    for (let i = 0; i < total; i++) {
        // these property names are also specified when creating the TreeModel
        const d = {
            k: i,
            c: go.Brush.randomColor(),
            p: (i > 0 ? Math.floor(Math.random() * i / 2) : undefined) // the random parent's key
        };
        treedata.push(d);
    }
    // give the Diagram's model all the data
    myDiagram.model.nodeDataArray = treedata;
    // remove the status indicator
    myDiagram.remove(myLoading);

    window.myDiagram = myDiagram; // Attach to the window for console debugging
  }
  </script>
</body>
</html>